WO2008119295A1 - Contrôleur réparti de station de base et unité de celui-ci, et procédé de transmission de données - Google Patents

Contrôleur réparti de station de base et unité de celui-ci, et procédé de transmission de données Download PDF

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Publication number
WO2008119295A1
WO2008119295A1 PCT/CN2008/070590 CN2008070590W WO2008119295A1 WO 2008119295 A1 WO2008119295 A1 WO 2008119295A1 CN 2008070590 W CN2008070590 W CN 2008070590W WO 2008119295 A1 WO2008119295 A1 WO 2008119295A1
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WIPO (PCT)
Prior art keywords
unit
signaling
interface
sub
subunit
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PCT/CN2008/070590
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English (en)
Chinese (zh)
Inventor
Shoubo Xie
Hongyu Zhao
Shucheng Yin
Haoming Zhong
Chun Zhang
Shuaibing Li
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CNA2007100962285A external-priority patent/CN101052003A/zh
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2008119295A1 publication Critical patent/WO2008119295A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/12—Access point controller devices

Definitions

  • the present invention relates to the field of communications, and in particular, to a distributed base station controller, a central unit, a remote unit, and a data transmission method in a distributed base station controller. Background technique
  • the core layer is deployed in the central office and connected to the tandem node through the optical network.
  • the aggregation layer node is deployed in the central computer room or module office of the cell; the access layer provides access ports for users.
  • the core layer is interconnected by high-speed optical links, mainly to provide fast forwarding of network packets and interconnection between aggregation nodes.
  • the aggregation layer is mainly composed of transmission devices located at the base station to access the aggregation node and the data aggregation point, and is responsible for traffic convergence and grooming in a certain area, and completes the convergence of the access layer traffic.
  • the existence of the aggregation layer avoids the problem that the access point directly enters the core layer, resulting in a large span of the access network and serious consumption of the backbone fiber.
  • the access layer consists of transmission equipment located at the base station, data service access point, and other service access points, and is responsible for accessing services to each aggregation layer node.
  • the UTRAN consists of a Radio Network System (RNS), which is connected to the core network through the Iu interface.
  • the RNS includes an RNC (Radio Network Controller) and one or more Node Bs (base stations).
  • the Node B supports FDD (Frequency Division Duplex) mode, TDD (Time Division Duplex) mode, or dual mode. It can process one or more cells and connect to the RNC through the Iub interface.
  • the RNC is responsible for switching control and provides support for different Node Bs. The ability to combine/split macro diversity. Node Bs that support FDD mode include optional macro diversity.
  • the RNCs are connected to each other through the Iur interface, and the Iurs can be directly connected through physical connections between the RNCs or connected through a suitable transmission network.
  • FIG. 2 shows a possible evolution of the IS-95/cdma2000 network, based on the existing IS-41 core network and the IS-634A RAN-CN interface standard being refined.
  • the radio access network side shown in FIG. 2 includes a BSC/PCF and a BTS (Base Transceiver Station), and the BSC/PCF entity is a base station controller and a PCF (Packet Support Node), and one BSC/PCF can Jurisdiction over multiple BTSs.
  • the BTS can be distributed in different locations according to its processing capabilities and performance to form a multi-level base station connection.
  • the BTS in Figure 2 is connected to an ODU (outdoor unit), and the BTS below the BTS is connected.
  • ODU outdoor unit
  • NodeBs base station units
  • RNCs base station controller units
  • BSC base station controller unit
  • the existing mobile communication device provider provides a base station controller unit which is generally an integrated unit, that is, the base station controller (RNC/BSC) is a whole.
  • the embodiment of the present invention discloses a distributed base station controller, to implement flexible networking, and the distributed base station controller includes: a central unit and at least one remote unit;
  • the central unit is configured to receive signaling and service data sent by the core network node, perform protocol conversion, and send the signal to the remote unit; receive signaling and service data sent by the remote unit, perform protocol conversion, and send To the core network node; and to the weakened unit and the business is weak Related operational processing;
  • the remote unit is configured to receive signaling and service data sent by the central unit, perform service processing and signaling processing, and perform protocol conversion on the processed service data and signaling, and then send the data to the base station;
  • the service data and signaling sent by the base station perform service processing and signaling processing, and perform protocol conversion on the processed service data and signaling, and then send the data to the central unit.
  • An embodiment of the present invention further discloses a central unit, where the central unit includes: an uplink interface subunit, an internal interconnection interface subunit, and a public service management subunit;
  • the uplink interface subunit is configured to receive signaling or service data sent by the core network node, perform protocol conversion, and send the signal to the internal interconnect interface subunit; and receive signaling or service data sent by the internal interconnect interface subunit. , after the protocol is converted, sent to the core network node;
  • the internal interconnection interface sub-unit is configured to receive signaling or service data sent by the uplink interface sub-unit, and send the signal to the remote unit; receive signaling or service data sent by the remote unit, and send the signal to the uplink Interface subunit
  • the public service management sub-unit is configured to perform public service management on the remote unit according to the information of the remote unit received by the internal interconnection interface subunit.
  • An embodiment of the present invention further discloses a remote unit, where the remote unit includes: an internal interconnect uplink interface subunit, a service processing subunit, a signaling processing subunit, and a downlink interface subunit; and the internal interconnect uplink interface a unit, configured to receive signaling and service data sent by the central unit, and separately sent to the service processing subunit and the signaling processing subunit;
  • the service processing sub-unit is configured to receive the service data sent by the intra-connected uplink interface sub-unit, perform service processing, and send the service data to the downlink interface sub-unit; receive the service data sent by the downlink interface sub-unit, and perform service After processing, sending to the internal interconnect uplink interface subunit;
  • the signaling processing sub-unit is configured to receive signaling sent by the internal interconnect interface sub-unit, perform signaling processing, and send the signaling to the downlink interface sub-unit; receive signaling sent by the downlink interface sub-unit, perform After the signaling processing, the method is sent to the intra-connected uplink interface sub-unit;
  • the downlink interface subunit is configured to receive service data sent by the service processing subunit, receive signaling sent by the signaling processing subunit, and perform protocol conversion, and then send the signal to the base station;
  • the service data is sent to the signaling processing subunit and the service processing subunit separately after performing protocol conversion.
  • Embodiments of the present invention also disclose a data transmission method in a distributed base station controller, the method comprising the following steps:
  • the remote unit of the distributed base station controller receives the service data sent by the downstream node;
  • the downstream node is a base station directly connected to the remote unit or a lower-level remote unit;
  • the remote unit processes the received service data locally; or, the received service data is aggregated and sent to a central unit of the base station controller for processing.
  • the distributed base station controller is adopted, so that the central unit mainly processes the public service management that is weakly related to the service, so that the remote unit can process the specific service, thereby passing the center unit and the remote unit.
  • Flexible deployment enables flexible networking.
  • the remote unit with multi-branch merge function can also be deployed on the transmission aggregation node, thereby achieving a higher degree of transmission aggregation.
  • FIG. 1 is a schematic structural diagram of a wireless access network of a WCDMA system in the prior art
  • FIG. 2 is a schematic diagram of an evolution of an IS-95/CDMA2000 network in the prior art
  • FIG. 3A, FIG. 3B and FIG. 3C are diagrams of Embodiment 1 of the present invention
  • FIG. 4A, FIG. 4B and FIG. 4C are schematic diagrams showing the structure of a remote unit of a distributed base station controller according to Embodiment 1 of the present invention.
  • FIG. 5A and FIG. 5B are schematic diagrams showing a service processing subunit in a remote unit according to Embodiment 1 of the present invention
  • 6A, FIG. 6B and FIG. 6C are schematic diagrams showing the structure of a distributed base station controller according to Embodiment 1 of the present invention
  • FIG. 7 is a schematic structural diagram of a cascading of remote units in a distributed base station controller according to Embodiment 1 of the present invention.
  • FIG. 8A and FIG. 8B are schematic diagrams of an access network based on a distributed base station controller according to Embodiment 2 of the present invention.
  • FIG. 9A and FIG. 9B are schematic diagrams of an access network using a distributed base station controller as a transmission aggregation node according to Embodiment 3 of the present invention. detailed description
  • This embodiment describes the structure of a distributed base station controller, and the structure of a central unit and a remote unit.
  • the components of their base station controllers are typically composed of the following essential logical components:
  • An interface unit configured to provide an uplink and downlink physical interface, where the uplink interface interacts with the core network node, and the downlink interface interacts with the base station;
  • a signaling processing unit configured to provide signaling processing capability
  • a service processing unit for providing service processing capability
  • Operation and maintenance unit for providing system management functions such as configuration, alarm, maintenance, and performance statistics;
  • a clock unit that is used to clock the system.
  • the clock unit and the operation and maintenance unit in the above unit may be regarded as a public service management unit that is not related to or weakly related to service processing, and the service processing unit and the signaling unit are dedicated processing units related to a specific service. Therefore, this embodiment is Improve system scalability, base station
  • the controller is divided into a central unit that is not related to the service (or weakly related) and a remote unit that is related to the service.
  • the central unit includes a shareable part of the base station controller, and the key part of the unit is composed of a common service management unit that is independent (or weakly related) to the system capacity, for example: a clock subunit, an operation and maintenance subunit, etc., the central unit In the case of system expansion, no additional configuration is required.
  • the remote unit includes a service processing part of the base station controller, and the unit is related to service processing, including a signaling processing subunit, a service processing subunit, and the like.
  • the remote unit can have multiple types, such as an SDU (Selection/Distribution Unit SDU), and the SDU unit has a soft handover merge function, which can be branched from the soft branch of the user terminal at the SDU.
  • SDU Selection/Distribution Unit
  • the SDU selects the best quality one and sends it to the core network.
  • the remote unit is closely related to how many sectors of the carrier frequency and how much processing traffic need to be carried. When the number of sector carriers that the system needs to support exceeds a certain specification, the corresponding remote unit needs to be added.
  • FIG. 3A is a schematic structural diagram of a central unit of a distributed base station controller according to Embodiment 1 of the present invention.
  • the central unit 10 includes: an uplink interface subunit 11, an internal interconnect interface subunit 12, a clock subunit 13, and an operation and maintenance sub-function.
  • Unit 14 (clock subunit 13 and operation and maintenance subunit 14 form a common service management subunit), wherein:
  • the uplink interface subunit 11 is configured to interact with a core network node.
  • the uplink interface sub-unit 11 may be an IuCS or IuPS interface unit.
  • the uplink interface sub-unit 11 converts the internal interface protocol signaling of the distributed base station controller into an IuCS or IuPS interface.
  • the signaling of the protocol is forwarded to the core network node, or receives the IuCS or IuPS interface protocol signaling sent by the core network node, and is converted into the internal base station protocol signaling of the distributed base station controller, and sent to the internal interconnect interface sub-unit 12
  • the uplink interface sub-unit 11 converts the data packet of the distributed base station controller internal interface protocol into a data packet of the IuCS or IuPS interface protocol, and forwards it to the core network node, or receives the IuCS sent by the core network node. Or the data packet of the IuPS interface protocol, and converted into a data packet of the distributed base station controller internal interface protocol, and sent to the internal interconnection interface sub-unit 12.
  • uplink The port unit 11 may be an A1/A2/A5 interface, or an A8/A9/A10/A11 interface unit.
  • the uplink interface sub-unit 11 converts the internal interface protocol signaling of the distributed base station controller.
  • the interface protocol signaling is sent to the internal interconnect interface sub-unit 12; on the service plane, the uplink interface sub-unit 11 converts the data packet of the distributed base station controller internal interface protocol into the data of the A2/A2p/A8/A10 interface protocol. Packets are forwarded to the core network node, or the data packets of the A2/A2p/A8/A10 interface protocol received from the core network node are converted into data packets of the distributed base station controller internal interface protocol, and sent to the internal interconnection. Interface subunit 12.
  • the internal interconnection interface sub-unit 12 performs information interaction with the remote unit.
  • the internal interconnect interface sub-unit 12 communicates using the internal interface protocol of the distributed base station controller.
  • the internal interconnect interface sub-unit 12 can receive the signaling and data packets sent by the remote unit and forward it to the operation and maintenance sub-unit 14 or to the core network node through the uplink interface sub-unit 11.
  • the internal interconnect interface sub-unit 12 may also send the operation instruction or information generated by the clock sub-unit 13 or the operation and maintenance sub-unit 14 to the remote unit, or may send the signaling or information of the core network node forwarded by the uplink interface sub-unit 11. Give the remote unit.
  • the clock sub-unit 13 may include a transmission clock synchronization sub-unit for transmitting a synchronization signal to the base station according to the information reported by the base station, and synchronizing the transmission clock of the base station.
  • the clock subunit 13 transmits the synchronization signal and other clock information to the intercom interface subunit 12.
  • the operation and maintenance sub-unit 14 is configured to receive information about configuration, alarm, maintenance, or performance statistics reported by the remote base station controller remote unit forwarded by the internal interconnection interface sub-unit 12, and pass the information to the network management center.
  • the interface is sent to the network management center for corresponding operation and maintenance processing. If necessary, the processing result and configuration data of the network management center are also received from the interface with the network management center, and then sent to the distribution through the internal interconnection interface sub-unit 12.
  • the operation and maintenance subunit 14 also typically includes a near end maintenance subunit for near end maintenance of the system.
  • the central unit can be expanded as needed.
  • the central unit may also include some of the service processing functions of the remote unit, i.e., one or more dedicated service processing sub-units may be included in the central unit.
  • Figure 3B shows a schematic diagram of the structure when a dedicated service processing subunit is included in the central unit.
  • the central unit 10 further includes a dedicated service processing sub-unit 30 on the basis of FIG. 3A, and the dedicated service processing sub-unit 30 includes a service processing sub-unit 33 and a signaling processing sub-unit 34;
  • the service processing sub-unit 33 is configured to receive the service data sent by the uplink interface sub-unit 11 of the central unit 10, perform the service processing, and send the service data to the internal interconnection interface sub-unit 12; receive the service data sent by the internal interconnection interface sub-unit 12, and perform After the service is processed, it is sent to the uplink interface subunit 11;
  • the signaling processing sub-unit 34 is configured to receive the signaling sent by the uplink interface sub-unit 11 of the central unit 10, perform signaling processing, and then send the signaling to the internal interconnect interface sub-unit 12; receive the signaling sent by the internal interconnect interface sub-unit 12. And performing signaling processing and sending to the uplink interface sub-unit 11.
  • the central unit can also directly connect with the base station, and the dedicated service processing sub-unit 30 in the central unit processes the data of the base station, so that the downlink interface sub-unit needs to be included in the central unit to transmit and receive data of the base station, and
  • FIG. 3C shows A schematic diagram of the structure of a central unit capable of communicating directly with a base station. As shown in Fig. 3C, a downlink interface subunit 15 is included in the central unit 10".
  • the downlink interface sub-unit 15 is connected to the base station, and is configured to receive signaling and service data sent by the base station, and perform protocol conversion processing of the signaling.
  • the downlink interface sub-unit 15 receives the signaling sent by the signaling processing sub-unit 34, and converts it into lub interface protocol signaling and sends it to the base station, or receives the lub interface protocol sent by the base station.
  • the signaling is converted into the distributed base station controller internal interface protocol signaling, and sent to the signaling processing sub-unit 34.
  • the downlink interface sub-unit 15 receives the service data sent by the service processing sub-unit 33, and The service data of the Iub interface protocol is sent to the base station, or the service data of the Iub interface protocol sent by the base station is received, and converted into the service data of the internal interface protocol of the distributed base station controller, and sent to the service processing sub-unit 33.
  • the downlink interface sub-unit 15 receives the signaling sent by the signaling processing sub-unit 34, and converts the protocol signaling converted to the Abis interface to the base station, or receives the Abis interface sent by the base station.
  • the protocol signaling is converted to the signaling of the internal base station protocol of the distributed base station controller and sent to the signaling interface sub-unit 34.
  • the downlink interface sub-unit 15 receives the service data sent by the service processing sub-unit 33.
  • the service data converted to the Abis interface protocol is sent to the base station, or the service data of the Abis interface protocol sent by the base station is received, and converted into service data of the internal base station protocol of the distributed base station controller, and sent to the service processing sub-unit 33.
  • the service processing sub-unit 33 is configured to receive the service data sent by the downlink interface sub-unit 15, perform the service processing, and send the service data to the uplink interface sub-unit 11; receive the service data sent by the uplink interface sub-unit 11, perform the service processing, and send the service data to the downlink interface. Subunit 15.
  • the signaling processing sub-unit 34 is configured to receive the signaling sent by the downlink interface sub-unit 15, and perform signaling processing, and then send the signaling to the uplink interface sub-unit 11; receive the signaling sent by the uplink interface sub-unit 11, and perform signaling processing. It is sent to the downlink interface subunit 15.
  • the remote unit 20 includes: a downlink interface subunit 21, an internal interconnect uplink interface subunit 22, and a service processing subunit 23. And a signaling processing subunit 24, wherein:
  • the internal interconnect uplink interface subunit 22 is configured to be connected to the central unit.
  • the internal interconnect uplink interface sub-unit 22 communicates using the internal interface protocol of the distributed base station controller.
  • the internal interface uplink interface sub-unit 22 can receive the service data sent by the central unit, and send it to the service processing sub-unit 23, and receive the signaling sent by the central unit, and send it to the signaling processing sub-unit 24.
  • the internal interconnect uplink interface sub-unit 22 may also transmit the service data or signaling sent by the service processing sub-unit 23 and the signaling processing sub-unit 24 to the central unit.
  • the service processing sub-unit 23 is configured to receive the service data sent by the downlink interface sub-unit 21, And the corresponding service processing is sent to the internal interconnect uplink sub-unit 22; the service processing sub-unit 23 also receives the service data sent by the internal interconnect uplink interface sub-unit 22, performs corresponding service processing, and sends the data to the downlink interface sub-unit 21.
  • the service processing sub-unit 23 may implement the service data forwarded by the internal interconnect uplink interface sub-unit 22 to send service data on multiple branches, or use the macro diversity to implement multi-branch merge for the service data received by the downlink interface sub-unit 21.
  • the service data sent on the multiple branches is combined and sent to the intra-connected uplink interface sub-unit 22.
  • the signaling processing sub-unit 24 is configured to receive the signaling sent by the downlink interface sub-unit 21, and perform signaling processing, and then send the signaling to the intra-connected uplink interface sub-unit 22; or receive the signaling sent by the internal interconnect uplink interface sub-unit 22. After the signaling processing, it is sent to the downlink interface sub-unit 21.
  • the downlink interface subunit 21 is connected to the base station, and is configured to receive signaling and service data sent by the base station, and perform protocol conversion processing.
  • the downlink interface sub-unit 21 receives the signaling sent by the signaling processing sub-unit 24, and converts it into an Iub interface protocol signaling and sends it to the base station, or receives the Iub interface protocol sent by the base station.
  • the signaling is converted into the distributed base station controller internal interface protocol signaling, and sent to the signaling processing sub-unit 24; on the service plane, the downlink interface sub-unit 21 receives the service data sent by the service processing sub-unit 23, and converts to The service data of the Iub interface protocol is sent to the base station, or the service data of the Iub interface protocol sent by the base station is received, and converted into the service data of the internal interface protocol of the distributed base station controller, and sent to the service processing sub-unit 23.
  • the downlink interface sub-unit 21 receives the signaling sent by the signaling processing sub-unit 24, and converts it into an Abis interface protocol signaling and sends it to the base station, or receives the Abis interface protocol sent by the base station.
  • the signaling is converted into the distributed base station controller internal interface protocol signaling, and sent to the signaling interface sub-unit 24;
  • the downlink interface sub-unit 21 receives the service data sent by the service processing sub-unit 23, and converts to The service data of the Abis interface protocol is sent to the base station, or the service data of the Abis interface protocol sent by the base station is received, and converted into service data of the internal interface protocol of the distributed base station controller, and sent to the service processing sub-unit 23.
  • the remote units can also be cascaded, and an internal interconnected downlink interface subunit 25 is needed inside the remote unit, as shown in FIG. 4B, the internal interconnected downlink interface subunit 25 and The internal interconnect uplink interface sub-unit of the next-level remote unit is wired (such as through a cable or access network) to implement data interaction.
  • the remote unit can be configured according to different specific services, for example, a remote unit that implements multi-branch merging and traffic aggregation.
  • the service processing sub-unit 23 can be as shown in FIG. 5, and includes:
  • the multi-branch merging sub-unit 233 is configured to combine the received multi-branch service data and send the data to the data recombination sub-unit; the sub-unit may also be subdivided into a local multi-branch merging sub-unit 2331 and a downstream multi-branch merging sub-unit 2332.
  • the local multi-branch merging sub-unit 2331 is configured to perform multi-branch merging on the data received by the remote unit from the base station directly connected thereto, and the downstream multi-branch merging sub-unit 2332 is configured to pull the remote unit from the next level
  • the data received by the unit is multi-branch merged;
  • the data reassembly sub-unit 232 is configured to repackage the combined service data of the multi-branch merge sub-unit 233, package the plurality of service data packets into one service data packet, and send the data to the data convergence sub-unit 231;
  • the data convergence sub-unit 231 is configured to perform statistical multiplexing on the uplink data stream to save uplink transmission bandwidth.
  • the service processing sub-unit 23 of the remote unit may further include a local switching sub-unit 235 for performing local exchange of service flows for calls between users.
  • the call between users here refers to the call between the users of the base station directly connected to the remote unit, and these user traffic flows use the same vocoder; for downstream traffic, the call between users here Refers to the call between users in the next-level remote unit of the remote unit, and these user traffic streams use the same vocoder.
  • the remote unit may further include a resource management subunit, as shown in FIG. 4C.
  • the resource management sub-unit 26 is configured to perform load distribution according to the service processing capability of the remote unit.
  • the resource management sub-unit 26 allocates the load to the board of the local remote unit as much as possible for processing, when the resource management subunit
  • the service processing sub-unit 23 is overloaded (for example, it is detected that the CPU load of the remote unit reaches a preset threshold)
  • a part of the load may be distributed to the central unit through the internal interconnection interface sub-unit 22 for processing.
  • the above central unit and remote unit constitute a distributed base station controller.
  • the distributed base station controller of this embodiment includes a central unit and at least one remote unit.
  • the central unit and the remote unit can be directly connected by cable or fiber optic cable, or they can be interconnected via a transmission network.
  • the internal interconnection interface subunit of the central unit and the internal interconnection uplink subunit of the remote unit can be connected through a transmission network, and communicated by using the distributed base station controller internal interface protocol.
  • the central unit and the remote unit in the distributed base station controller can be deployed independently, and one central unit can be connected to multiple remote units.
  • the central unit can also be combined with the remote unit to form a hybrid.
  • the distributed base station controller architecture can facilitate the expansion of the mobile communication system. When the system capacity is increased, the remote unit on the base station controller side can be flexibly increased for expansion.
  • the distributed base station controller can be as shown in Figures 6A, 6B and 6C depending on the different expansion of the central unit.
  • the distributed base station controller shown in FIG. 6A is composed of a central unit 10 and a plurality of remote units 20, and an internal interconnection interface subunit of the central unit 10 and an internal interconnection uplink interface subunit of the remote unit can pass through a transmission network. Connection, communication using the distributed base station controller internal interface protocol.
  • the central unit 10 includes a subunit that implements a common service management function, such as a clock subunit 13, an operation and maintenance subunit 14, and the like.
  • the distributed base station controller shown in FIG. 6B is the distributed base station control shown in FIG. 6A.
  • the central unit 10 in addition to the sub-units that implement the common service management function, such as the clock sub-unit 13, the operation and maintenance sub-unit 14, and the like, may further include a remote sub-unit 30 that implements a dedicated service processing function.
  • the central unit 10 is capable of realizing the function of the partial remote unit.
  • the distributed base station controller shown in FIG. 6C is based on the distributed base station controller shown in FIG. 6B, and the central unit 10" further includes a downlink interface subunit 15 to make the central unit 10"
  • the unit 30 is connected to the base station through the downlink interface sub-unit 15, so that the central unit 10" can directly communicate with the base station, and correspondingly controls and manages the base station through the internal remote sub-unit 30.
  • the distributed base station controller can be as shown in FIG. 7.
  • the remote unit can be cascaded in multiple stages, and only two stages of cascade are shown in the figure.
  • the remote unit 1 is connected with a remote unit.
  • the unit 4 and the remote unit 5, the remote unit 1 can also be connected to one or more base stations (only the case of connecting one base station is shown in the figure).
  • the structure of the remote unit 1 can be as shown in FIG. 4B, and the structure of the remote unit 4 or the remote unit 5 can be as shown in FIG. 4A or FIG. 4C, and the center unit can be as shown in FIG. 3A, FIG. 3B or FIG. 3C.
  • This embodiment describes a radio access network networking structure based on a distributed base station controller, and a processing flow of the distributed base station controller.
  • FIG. 8A is a schematic diagram of an access network based on a distributed base station controller according to Embodiment 2 of the present invention.
  • a central unit C_BSC is included, and the BTS may be directly connected to the C_BSC, or may be connected to one.
  • multiple remote units R_BSC, one R_BSC can aggregate several base stations and implement call processing of these base stations. among them,
  • C_BSC mainly provides the shared function of the base station controller.
  • One or more C_BSCs may be included in the access network.
  • C_BSC can also be equipped with some remote subunits as needed.
  • C_BSC can be deployed in a central city based on the principle of easy maintenance, such as MGW (Media GateWay, Media Gateway) / MSCe (Mobile Soft Switching Center). Computer room.
  • MGW Media GateWay, Media Gateway
  • MSCe Mobile Soft Switching Center
  • R_BSC mainly provides the service processing function of the base station controller.
  • the R_BSC can be deployed in the same room as the BTS or transport aggregation device.
  • the C_BSC and the R_BSC constitute a distributed base station controller, and the distributed base station controller structure can be as described in the first embodiment.
  • the processing flow of C_BSC (which can be structured as shown in Figure 3A) is:
  • the uplink interface sub-unit of C_BSC performs protocol conversion on the signaling received from the IuCS or IuPS interface, and forwards it to the corresponding R_BSC through the internal interconnection interface sub-unit for processing;
  • C_BSC The uplink interface sub-unit converts the service data received by the IuCS or the IuPS interface into a format of the C_BSC and the R_BSC internal interface protocol, and forwards the data to the corresponding R_BSC through the internal interconnection interface sub-unit for processing;
  • the uplink interface sub-unit of the C_BSC converts the signaling of the internal interface protocol sent by the R_BSC received by the internal interconnection interface sub-unit to the signaling of the IuCS or IuPS interface protocol, and forwards the signal to the IuCS or IuPS interface protocol.
  • the core network device on the service plane, the uplink interface sub-unit of the C_BSC converts the service data of the internal interface protocol sent by the R_BSC received by the internal interconnection interface sub-unit into the service data of the IuCS or IuPS interface protocol, and forwards the service data to Core network equipment;
  • the internal interconnection interface sub-unit of C_BSC collects alarms from R_BSC, and sends performance information to the operation and maintenance sub-unit, which is sent to the network management center, and the configuration data is passed through the operation and maintenance sub-men.
  • the unit and the internal interconnect interface subunit are sent to each R_BSC.
  • C_BSC (which may be structured as shown in Fig. 3A) is basically the same as that in the above WCDMA system, except that:
  • the uplink interface subunit of the C_BSC Since the uplink interface subunit of the C_BSC is connected to the core network device through the Al/Alp or A9/A11 interface on the signaling plane, the uplink interface subunit is in Al/Alp when transmitting and receiving signaling. Or the A9/A11 interface protocol format and the distributed base station controller internal interface protocol format are mutually converted.
  • the uplink interface sub-unit of the C_BSC is connected to the core network device through the A2/A2p/A8/A10 interface on the service plane. Therefore, when the uplink interface sub-unit transmits and receives service data, the A2/A2p/A8/A10 interface protocol is used.
  • the format is converted to and from the distributed interface controller internal interface protocol format.
  • R_BSC (which can be structured as shown in Figure 4C) is:
  • the inter-connected uplink interface sub-unit of the R_BSC sends the signaling from the C_BSC to the signaling processing sub-unit for processing, and then sends the signaling to the downlink interface sub-unit, which converts the processed signaling into The lub interface signaling format is sent to the NodeB; at the same time, the R_BSC signaling processing sub-unit also implements radio resource management; on the service plane, the R_BSC internal interconnect uplink interface sub-unit sends the service data from the C_BSC to the service processing sub-unit The processing is performed, and then sent to the downlink interface sub-unit, which converts the processed service data into a lub interface data format and sends it to the NodeB.
  • the service data can also be sent on multiple branches at the same time through the service processing sub-unit in the remote unit of the corresponding R_BSC.
  • the downlink interface sub-unit of the R_BSC converts the signaling sent by the lub interface into an internal message format, and processes the signaling processing sub-unit, and then forwards it to the C_BSC by the intra-connected uplink interface sub-unit;
  • the downlink interface sub-unit of the R_BSC converts the service data sent by the lub interface into an internal message format, and after being processed by the service processing sub-unit, if the macro-diversity is implemented, the intra-interface uplink sub-unit forwards the C_BSC to the C_BSC. ;
  • the R_BSC collects alarms, performance statistics, and other information, and sends them to the C_BSC through the interface between the C_BSC and the R_BSC, and accepts the configuration data delivered by the C_BSC.
  • the processing flow of the R_BSC is basically the same as that in the WCDMA system described above, except that: Since the downlink interface sub-unit of the R_BSC is connected to the base station through the Abis interface on the signaling plane and the service plane, the downlink interface sub-unit controls the Abis interface protocol format and the distributed base station when transmitting and receiving signaling and service data.
  • the internal interface protocol formats are converted to each other.
  • FIG. 8B is a second schematic diagram of an access network based on a distributed base station controller according to Embodiment 2 of the present invention.
  • the access network structure shown in FIG. 8B is based on FIG. 8A.
  • the R_BSC performs multi-stage cascading, and one R_BSC can aggregate several R_BSCs of the next level and a plurality of base stations.
  • R_BSC1 (which may be structured as shown in Fig. 4B) is connected to R_BSC4 and R_BSC5 (the structures of R_BSC4 and R_BSC5 may be as shown in Fig. 4A or 4C, respectively), and the BTS.
  • the processing flow of its signaling or data is similar to the above process. Since the communication protocol adopted by the internal interconnection downlink interface subunit of R_BSC1 and the internal interconnection uplink interface subunit of R_BSC4 or R_BSC5 is an internal protocol of the distributed base station controller, protocol conversion is not required.
  • the R_BSC can be deployed as close as possible to the base station, which helps to improve the performance of the wireless network due to the shortened control path. You can deploy a 1_88 in the concentrated area of the base station, and then cascade to the central controller in a cascaded manner. It can be flexibly deployed according to the characteristics of the transmission network.
  • the reason for the cascaded network is related to the transmission network. If the wireless network is built in a relatively dispersed area, there are fewer users. If a non-distributed network is adopted, the coverage of one controller is very large, and the base stations in remote areas. The distance to the controller is very far. In this scenario, it is suitable for multi-level cascade for level-by-level aggregation. Another scenario is that users are distributed in a strip-like area, such as a coverage of a traffic line or a coverage area on both sides of a river. In this scenario, it is also suitable for multi-level cascading for level-by-level convergence.
  • the C_BSC can be independently expanded, and the number of R_BSCs can also be increased as needed. Therefore, the access network system architecture based on the distributed base station controller is very flexible. Due to the capacity and function of the R_BSC, the volume can be reduced and the meshing is more flexible.
  • the remote unit After the base station controller is distributed, the remote unit can be deployed flexibly and can be deployed to any location according to network performance requirements and transmission network structure requirements. In order to reduce the carrier's leased transmission network For the cost of the network, the remote unit with the aggregation function in the distributed base station controller, such as the SDU unit with the soft handover and merge function, can be deployed on the aggregation node in the transmission network to reduce the resource occupation and reduce the cost.
  • the transmission network In the current mobile communication (such as CDMA/WCDMA/GSM system) transmission network, the transmission network is often divided into the "last mile” access part and the metro backbone transmission network; the "last mile” access method is diverse.
  • the current mainly based on microwave transmission.
  • microwave transmission networking there is basically one transmission aggregation node, and the setting of the transmission convergence point can reduce the resource requirement to the transmission network.
  • This embodiment describes a soft handover combining function in a distributed base station controller.
  • the SDU unit is decentralized to the radio access network structure of the transmission sink node, and the data processing process.
  • FIG. 9A is a schematic diagram of an access network using a remote unit (an SDU unit with a soft handover combining function) in a distributed base station controller as a transmission aggregation node according to Embodiment 3 of the present invention.
  • a plurality of BTSs are included, wherein a part of the BTSs are aggregated to R_BSC1 (the structure thereof can be as shown in FIG. 4A or FIG. 4C), and a part of the BSTs are aggregated to the R_BSC2 (the structure of which can be as shown in FIG. 4A or FIG.
  • R_BSC1 and R_BSC2 are connected to C_BSC via a transmission network (for example, a synchronous digital transmission network SDN transmission network) (the structure can be as shown in FIG. 3A, FIG. 3B or FIG. 3C).
  • a transmission network for example, a synchronous digital transmission network SDN transmission network
  • C_BSC is a central unit
  • R_BSC1 and R_BSC2 are remote units
  • R_BSC1 is an SDU unit with soft handover combining function
  • R_BSC1 is located at a transmission aggregation node.
  • the base station can be lxS222, supports 168TCE, and is configured as two Els.
  • the SDU unit selects the best quality one from the SDU at the SDU at the two soft handoff branches of the MS/UE (user terminal) and then sends it to the core network. Due to the soft handover and merge function of the SDU, the resource requirements on both sides of the SDU are different.
  • the SDU downlink direction (to the base station side) needs more than the uplink direction (to the core network direction). Transfer resources.
  • the R_BSC1 is a remote unit mainly composed of an SDU processing unit having a soft handover combining function, and 1 _: 88 (1 is placed on the transmission aggregation node, and the macro diversity set function of the SDU itself can be utilized, so that multiple After the branches are merged, the network is transferred.
  • the downlink interface subunit of the R_BSC1 receives the service data and signaling sent by the base station, and converts the service data and signaling into the service data and signaling format of the internal base station protocol of the distributed base station controller, and converts the service data after the protocol conversion.
  • the service processing sub-unit of R_BSC1 may include a multi-branch merge sub-unit and a data recombination sub-unit.
  • the multi-branch merge sub-unit uses its own macro-division and function to select the best quality for the multi-branch data in the service data, and combines the multi-branch processing and then sends it to the data recombination sub-unit; the data recombination sub-unit can be re-established
  • the service data is packaged.
  • the data reassembly subunit After receiving the uplink air interface frame, the data reassembly subunit reorganizes the uplink frame, and the long packet mode may be adopted, that is, multiple service data packets are grouped into one uplink service data packet, and then the processed service is processed.
  • the data packet is sent to the internal interconnect interface subunit of 1_:88 (1).
  • the service processing subunit of R_BSC1 may further include a data convergence subunit, which can receive the data packet reorganized by the data recombination subunit, and performs statistical multiplexing. After the traffic is aggregated, it is sent to C_BSC through the internal interconnect interface sub-unit.
  • the service processing sub-unit of R_BSC1 may also include a local switching sub-unit for processing service data that may be processed locally without being sent to the core network or other network equipment. For example, for a user using the same vocoder, the call service after the call connection is established can be directly exchanged by the R_BSC1 locally, and does not need to be sent to the core network for processing, thereby saving part of the bandwidth. Reduce network latency.
  • the signaling processing sub-unit of the R_BSC1 After receiving the service data, the signaling processing sub-unit of the R_BSC1 performs signaling processing, and sends the processed signaling to the internal interconnect interface sub-unit of the R_BSC1; After receiving the processed service data and signaling, the internal interconnection interface sub-unit of R_BSC1 sends it to C_BSC.
  • the service data can be re-packaged, and the plurality of service data packets are converted into one uplink service data packet by using the long packet method, so that each service is The proportion of overhead bits of the data packet is greatly reduced; in addition, since a plurality of data packets are combined into one data packet, the number of uplink packets is greatly reduced, and thus the number of packets on the SDH transmission network is greatly reduced. As a result, the leased or self-built SDH transmission network resources can be greatly reduced.
  • an R_BSC (such as an SDU unit with soft handover function) having a distribution selection processing function may be placed on a suitable transmission aggregation node according to a network topology structure.
  • this R_BSC can be placed at the branch to the trunk, close to the backbone transmission network, such as the access portion of the "last mile"; for chain networking, this R_BSC can be placed at The place between the chain and the backbone transmission network.
  • the remote unit Since the remote unit can be cascaded in multiple stages, it can also connect to the base station itself. Therefore, the process of receiving the remote unit from its next-stage remote unit is called downstream traffic, and the traffic received from the base station to which it is connected. Called local traffic.
  • the remote unit at the aggregation node directly processes the received local traffic locally, and aggregates the received downstream traffic (non-local traffic) and uploads it.
  • FIG. 9B is a second schematic diagram of an access network using a remote unit (SDU unit) in a distributed base station controller as a transmission aggregation node according to Embodiment 3 of the present invention.
  • the access network is based on FIG. 9A.
  • R_BSC1 (the structure of which can be as shown in FIG. 4B) is cascaded with R_BSC3 (the structure can be as shown in FIG. 4A or FIG. 4C) and R_BSC4 (the structure can be as shown in FIG. 4A or FIG. 4C), and R_BSC1 can also be directly Connected to the BTS.
  • R_BSC1 When R_BSC1 performs aggregation processing on the received service data, the local traffic and the downstream traffic are processed separately.
  • the processing procedure is as follows:
  • the multi-branch merging sub-unit performs multi-branch merging processing.
  • the user of the R_BSC3 and the R_BSC4 are governed by the downstream multi-branch merging sub-unit in the R_BSC1. Data between users is multi-branch merged.
  • the local multi-branch merging sub-unit and the downstream multi-branch merging sub-unit send the combined data stream to the data recombining sub-unit for repackaging, and the data recombining sub-unit sends the packed data to the traffic convening sub-unit for statistical multiplexing, and then Send to the internal interconnect interface subunit.
  • the local exchange sub-unit of the R_BSC1 performs local exchange of the call data between the users in the local traffic, and locally exchanges the call data between the R_BSC3-managed user and the R_BSC4-managed user in the downstream traffic.
  • the local exchange mentioned here means that the service flow of the user using the same vocoder can directly exchange the service flow in the remote unit without being sent to the core network for processing.
  • the resource management sub-unit can be set internally by R_BSC1 to implement monitoring and distribution of 1_88 (1 service load.
  • the resource management sub-unit monitors the traffic load of R_BSC1
  • part of the service data can be sent to C_BSC1 for processing, so as to reduce the load of R_BSC1, achieve the purpose of resource sharing, and ensure the quality of service.
  • the R_BSC (such as the SDU unit) with the distribution selection processing function can also be set in the transmission aggregation node of the live network to implement the multi-branch merging function and enhance the convergence capability of the transmission aggregation node.
  • the SDU unit includes an uplink interface sub-unit, and the multi-branch merged data is uploaded to the upper-layer network entity through the transport network and the network entity in the uplink direction, the R_BSC or the C_BSC of the previous level. Process it.
  • the combination of the R_BSC and the transmission aggregation node deployment in the traditional radio access network enables the transmission network and the mobile communication network to exhibit a certain degree of convergence, thereby saving system resources and saving in the mobile network construction.
  • Improve wireless network performance The R_BSC in the embodiment of the present invention can implement a local switching function to further save part of the bandwidth and reduce network delay.
  • the resource management function in the R_BSC can implement resource sharing to ensure service quality.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un contrôleur réparti de station de base et une unité de celui-ci, et un procédé de transmission de données, dans lequel, le contrôleur réparti de station de base comprend une unité centrale et au moins une unité distante ; l'unité centrale est utilisée pour réaliser une transformation du protocole pour des données de service et de signalisation interfonctionnant entre un réseau d'infrastructure et l'unité distante, et pour réaliser une opération faiblement corrélée avec le service pour l'unité distante ; l'unité distante est utilisée pour réaliser une transformation du protocole pour des données de service et de signalisation interfonctionnant entre l'unité centrale et une station de base, et pour fusionner en branches multiples et rassembler des données montantes reçues, et pour envoyer à l'unité centrale. Lorsqu'il y a plusieurs unités distantes, il est possible de se connecter à l'unité centrale respectivement, ou de cascader avec l'unité centrale. En adoptant la présente invention, il est flexible de configurer un réseau, et la capacité de rassemblement du nœud collecteur de transmission peut être avancée en déployant l'unité SDU ayant la fonction de fusion en branches multiples dans la station de base répartie au nœud collecteur de transmission dans un réseau d'accès radio.
PCT/CN2008/070590 2007-03-31 2008-03-26 Contrôleur réparti de station de base et unité de celui-ci, et procédé de transmission de données WO2008119295A1 (fr)

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CN200710130069.6 2007-07-30
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